Performance Analysis of Active Anti-islanding Techniques for Photovoltaic Application

In this paper some anti-islanding detection methods are evaluated through MatLab/Simulink® models. The methods are embedded into the control system of a voltage source inverter that is used to inject power to the grid from a set of photovoltaic modules. Due to low efficiency of the passive methods in detection of islanding and to the high cost of implementing the remote methods, only the active methods will be evaluated. In that sense, this paper presents comparative analysis regarding Active Frequency Drift (AFD), Slip-Mode Frequency Shift (SMS) and Sandia Frequency Shift (SFS) methods. Commonly, the active methods are implemented combining the passive sub/overvoltage and sub/overfrequency protection methods. The simulations presented comply with the voltage and frequency limits established by IEEE Std 929-2000 and harmonic distortion established by IEEE Std 519-2014.